Our IMRT Check software module is a leading independent second-check calculator for IMRT and arc therapy (VMAT/RapidArc) treatment plans. This powerful software uses a modified Clarkson’s algorithm to quickly and efficiently perform monitor unit calculations. IMRT Check can be used in addition to film dosimetry and phantom studies as another verification process in your Quality Assurance procedures.


  • FDA 510(k) market clearance
  • Intuitive user interface – only two input screens required to verify the dose calculated by a treatment planning system or phantom measurements
  • Automatically imports plan data from DICOM RT Plan file
  • Supports all Varian, Elekta, Brainlab, and Siemens MLC configurations
  • Off-axis calculations for traditional (static-gantry) IMRT plans
  • Supports both SSD and SAD setups
  • Volumetric averaging tool for calculating doses to calculation points in high-gradient regions
    • Optionally calculates 9 additional points around user-defined area
    • Shows dose and % difference for each point
  • Supports static (step and shoot) and Dynamic (sliding window) IMRT plans
  • Supports arc therapy plans (RapidArc, Smart Arc, VMAT) using isocenter and average SSD/depth/effective depth
    • For a more advanced arc therapy solution, please see our VMAT Module
  • Photon Energy Adjustments
    • Allows easy adjusting due to rounded leaf tips
    • Allows overall leaf transmission adjustments
  • Ability to save plan calculations for later recall
  • Uses algorithm developed by J. H. Kung (Medical Physics 27(10), p. 2226, October 2000)
    • Modified Clarkson’s integration, using annulars instead of pie sectors


IMRT Check Calculation